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Young's Modulus from a 3 Point Bend Test?

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  • 17-03-2016 8:17pm
    #1
    Captain Slow IRL
    Registered Users Posts: 3,651 ✭✭✭


    Hi all,

    I carried out a 3 point bend test on some samples, to determine youngs modulus but I'm not sure if I'm going about it the correct way.

    Am I right in saying, I can't measure strain; just deflection? If so, I take it I can't use the elastic portion of the graph to get "E"?

    Thanks in advance.


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    #2
    Johnnyhpipe
    Closed Accounts Posts: 748 ✭✭✭Johnnyhpipe


    Young's Modulus equals stress/strain. You can measure strain using strain gauges. Have you done this? You can buy them online.

    Stress however cannot be measured. This needs to be calculated.


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    #3
    Captain Slow IRL
    Registered Users Posts: 3,651 ✭✭✭Captain Slow IRL


    No, the test results plots force against extension (or deflection)


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    #4
    Johnnyhpipe
    Closed Accounts Posts: 748 ✭✭✭Johnnyhpipe


    I'm not sure how you would accurately do this then. An axial tensile test would have been more appropriate since then E = stress/strain which equals (load/area) / (change in length/length)

    If you're only doing bending tests then strain gauges should have been applied IMHO.


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